LONDON, Jan 25 (Reuters) - London-focussed estate agents Foxtons said its core earnings and revenue fell in 2017 in line with market expectations due to a slump in sales and that this year would remain challenging for the business.

The firm said 2017 revenue will fall around 12 percent to 117 million pounds ($167 million) and adjusted core earnings will drop 40 percent to roughly 15 million pounds. It will also take a one-off 2 million pound charge as it manages its cost base.